Pressure locked return manifold

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Dedpossum

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Good afternoon!

I have quite the puzzle here.

I have installed a hydronic system for a very small house (900 sf).

I have a total of 1200 feet of HE 1/2 pex broken into 4 - 300 foot loops.

I have a taco 007 w/ IFC circulator pump with arrow pointing towards the supply manifold (hotwater to the loops).

I also isolated each loop to make sure the supply matches the return, and they do.

If I use fresh water and vent the return manifold into the drain everything runs awesome.

There is no air in the lines

When I attempt to cycle the system using the Taco 007 there is no circulation. I end up with a large amount of pressure in the return manifold. So much so that the valves are held shut by the pressure. And I have to relieve the pressure through the end cap of the manifold.

I installed another back flow preventer between the boiler and the Taco and the problem remains the same.

I am really scratching my head here because it truly seams like I've done everything "right". So I think I am overlooking the obvious. I have enough pipe, fittings and time to redo whatever is necessary.


Advice would be most welcome!

IMG_20160923_160520.jpg
IMG_20160919_221432.jpg


Sincerely,

Ded

P.s yes nothing is supported yet.
 

WorthFlorida

Clinical Trail on a Cancer Drug Started 1/31/24. ☹
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It does look like the expansion tank is new. I would double check that it is set to the correct pressure and not leaking any air from the internal bladder.
 
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